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ASN Wikibase Occurrence # 180304
Last updated: 12 October 2021
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Date:11-OCT-2015
Time:c. 11:35 LT
Type:Silhouette image of generic EC30 model; specific model in this crash may look slightly different
Eurocopter EC 130B4
Owner/operator:Penerbangan Angkasa Semesta
Registration: PK-BKA
MSN: 4813
Fatalities:Fatalities: 4 / Occupants: 5
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:Lake Toba in the Onang Runggu subdistrict of Samos -   Indonesia
Phase: En route
Nature:Passenger - Non-Scheduled/charter/Air Taxi
Departure airport:Samosir island
Destination airport:Kualanamu airport
Narrative:
The chartered helicopter is missing. One occupant was found alive on Tuesday 13 October 2015, floating with the aid of a seat cushion. He stated that all five occupants jumped from the helicopter before the helicopter crashed into the lake. As the four other occupants have not been found, they are presumed to have died.

The survivor stated that after takeoff the aircraft flew over the coastline of the Toba Lake for about 2 minutes. He could see the coastline of Toba Lake with the existing visibility. The aircraft then turned to the right and fly straight about 3 minutes. The weather became darker and he no longer able to see the surface of Toba Lake. The aircraft turned to the left before impacting the water.

The aircraft was equipped with an Emergency Flotation System but the EFS was not deployed.
All occupants evacuated the helicopter and stayed together floating using the seat cushions. The group was then separated by big waves. The surviving passenger stayed with another occupant until the second day after the accident then they were separated by big waves. The surviving passenger stayed on the water for approximately 50 hours until being rescued.
Most of the occupants did not survive likely due to prolonged stay on the water and not wearing life vests. The delayed rescue was due to the fact that the location of the helicopter and survivor positions was not identified.

Contributing Factors:
The pilot likely experienced spatial disorientation during flying in low visibility resulting in the inability to determine aircraft attitude and position.
Unavailability of individual flotation devices and un-inflated of aircraft flotation device [sic]decreased the chances of occupant survivability.
The search and rescue efforts were limited as the pilots did not hold instrument ratings permitting take-off from Medan.

Sources:

www.jakartaglobe.beritasatu.com/nesw/breaking-helicopter-carrying-five-missing-n-sumatra/
http://jakartaglobe.id/news/survivor-found-helicopter-crash-lake-toba/
http://www.bea.aero/fr/enquetes/2015/2015.semaine.42.pdf
http://kemhubri.dephub.go.id/knkt/ntsc_aviation/baru/pre/Preliminary%20Report%20PK-BKA.pdf
http://kemhubri.dephub.go.id/knkt/ntsc_aviation/baru/Final%20Report%20PK-BKA.pdf

Safety recommendations:

Safety recommendation 04.O.2016.32.1 issued 16 May 2016 by NTSC to Penerbangan Angkasa Semesta
Safety recommendation 04.O.2016.34.1 issued 16 May 2016 by NTSC to BASARNAS
Safety recommendation 04.O.2016.58.1 issued 16 May 2016 by NTSC to Penerbangan Angkasa Semesta
Safety recommendation 04.R.2016.33.1 issued 16 May 2016 by NTSC to DGCA Indonesia


Revision history:

Date/timeContributorUpdates
11-Oct-2015 12:19 gerard57 Added
11-Oct-2015 16:51 rotorspot Updated [Aircraft type, Cn]
11-Oct-2015 19:18 Aerossurance Updated [Time, Nature, Narrative]
12-Oct-2015 09:07 TB Updated [Time, Aircraft type, Other fatalities]
13-Oct-2015 18:37 gerard57 Updated [Location, Source, Damage, Narrative]
13-Oct-2015 18:55 gerard57 Updated [Narrative]
18-Oct-2015 18:09 gerard57 Updated [Total fatalities, Narrative]
28-Oct-2015 18:59 Aerossurance Updated [Source, Narrative]
20-Jan-2016 19:15 Aerossurance Updated [Source, Narrative]
16-Jun-2016 16:47 Aerossurance Updated [Source]
16-Jun-2016 17:23 Aerossurance Updated [Narrative]

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